September 2017 Update

Task/Apply-a-callback-to-an-array/C-sharp/apply-a-callback-to-an-array-1.cs

@@ -1,34 +1,11 @@
-using System;
+int[] intArray = { 1, 2, 3, 4, 5 };
+// Simplest method:  LINQ, functional
+int[] squares1 = intArray.Select(x => x * x).ToArray();
 
-static class Program
-{
-  // Purpose: Apply a callback (or anonymous method) to an Array
-  // Output: Prints the squares of an int array to the console.
-  // Compiler: Visual Studio 2005
-  // Framework: .net 2
+// Slightly fancier: LINQ, query expression
+int[] squares2 = (from x in intArray
+                  select x * x).ToArray();
 
-  [STAThread]
-  public static void Main()
-  {
-    int[] intArray = { 1, 2, 3, 4, 5 };
-
-    // Using a callback,
-    Console.WriteLine("Printing squares using a callback:");
-    Array.ForEach<int>(intArray, PrintSquare);
-
-    // or using an anonymous method:
-    Console.WriteLine("Printing squares using an anonymous method:");
-    Array.ForEach<int>
-    (
-      intArray,
-      delegate(int value)
-      {
-        Console.WriteLine(value * value);
-      });
-  }
-
-  public static void PrintSquare(int value)
-  {
-    Console.WriteLine(value * value);
-  }
-}
+// Or, if you only want to call a function on each element, just use foreach
+foreach (var i in intArray)
+    Console.WriteLine(i * i);

Task/Apply-a-callback-to-an-array/C-sharp/apply-a-callback-to-an-array-2.cs

@@ -1,2 +1,34 @@
-int[] intArray = { 1, 2, 3, 4, 5 };
-Array.ForEach(intArray, i => Console.WriteLine(i * i));
+using System;
+
+static class Program
+{
+  // Purpose: Apply a callback (or anonymous method) to an Array
+  // Output: Prints the squares of an int array to the console.
+  // Compiler: Visual Studio 2005
+  // Framework: .net 2
+
+  [STAThread]
+  public static void Main()
+  {
+    int[] intArray = { 1, 2, 3, 4, 5 };
+
+    // Using a callback,
+    Console.WriteLine("Printing squares using a callback:");
+    Array.ForEach<int>(intArray, PrintSquare);
+
+    // or using an anonymous method:
+    Console.WriteLine("Printing squares using an anonymous method:");
+    Array.ForEach<int>
+    (
+      intArray,
+      delegate(int value)
+      {
+        Console.WriteLine(value * value);
+      });
+  }
+
+  public static void PrintSquare(int value)
+  {
+    Console.WriteLine(value * value);
+  }
+}